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Foundation Model release 10.2 has been made available and Trusted
Firmware has been tested against that it as part of its CI system.

This patch updates the user guide documentation to reflect the version
of Foundation Model that Trusted Firmware has been tested against.

Change-Id: I8571e1027b24892b41d04b93b24245a371ca2cae
Signed-off-by: David Cunado <david.cunado@arm.com>